Let-off mechanism for looms.



No. 747,273. PATLNTLD DEG. 15, 1903. H. TOMLINSON L J. J. MULD0WNEY- LET-OPF MECHANISM FOR LOOMS.

APPLICATION FILED MAY 1s, 190s.

no MODEL. v

weaefsses Patented ecember 1.5, 1903.

iaTnnT Tric f t HENRXT TOMLINSON AND JAMES J. MULDOWNEY, OF LAWRENCE, MASSA- CHUSETTS, ASSIGNORS TO DRAPER COMPANY, OF HOPEDALE, MASSA- CHUSETTS, A CORPORATION OF MAINE. I

LETHOFIF MECHANISli/l FOR LOOWlS.

SPECIFICATION forming part of Letters Patent No. 747,27 3, dated December 15, 1903.

Application led May 18,1903.

To @ZL whomt may concern:

Beit known that We, HENRY TOMLINSON and JAMES J. MULDOWNEY, citizens of the United States, and residents of Lawrence,

county of Essex, State ofMassachusetts, have invented an Improvement in Let Off Mechanism for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characro ters on the drawings representing like parts.

This invention relates more particularly to let-off mechanism for looms of the type wherein the warp-beam is positively rotated to gradually let oli" the warp as the weaving x5 progresses, looms of this type being shown in United States Patents Nos. 618,363 and 436,724. Both patents show the well-known Bartlett let-olii mechanism., wherein the tension of the warp depends upon the tension 2o of a spring, which is compressed when the warp depresses the whip roll or bar. The greater the tension of this spring the less will a given impulse of the warp compress it, and a correspondingly less motion will be given z5 .to the let-off. It is easier to ascertain when the loom is running whether the warp is subjected to the desired tension and it is desirable to be able to adj ust or change the tension while the loom is running, because it is go then easier to ascertain by the feel of the warp just what degree of tension is necessary. Heretofore it has not been possible in let-oli? mechanism of the type referred to to effect this adjustment when the loom is in operation nor to effect a very exact adjustment when the loom is at rest Without the exercise of considerable care and expenditure of time.

Our present invention in let-off mechanism 4o. has for its object the production of simple and effective means for quickly, readily, and` accurately adjustimgl or changing while the loom is in motion the tension of the spring which governsvthe tension and let-off of the warp.

The novel features of oui-invention WillbeV described in the subjoined specication and particularly pointed out in the following claims.

5o Figure 1 is a partial side elevation of a serial No. 157,617. (No model.)

loom provided with let-off mechanism embodying one practicalform of our invention; and Fig. 2 is a transverse sectional detail, to be referred to, on theline 2 2, Fig. l, looking toward the right.

We have illustrated our invention in connection with the Bartlett type of let-off mechanism, which includes a rocking carrier d for the whip roll or bar W, attached to a rock -shaft a, provided with a depending 6o rocker-arm a2, the bent rod l? longitudinally movable in a fixed guide bx on the loom side A and pivotally connected at one end with the rocker-arm a2 andthe springs s and .9X on the bent rod, the latter spring being held between an adjustable collar b on the rod and the perforated end of a lever c. A link c connects the lever With the pawl-carrierf, having a pawl g to cooperate with the ratchet e, attached to the upright actuating-shaft 01X, 7o provided'with a worm d, which through suitable gearing transmits rotative movementto the warp-beam B, all in well-known manner,

a collar c2 on the link being engaged by the actuator-rod c3, connected with and operated by a moving part of the loom, as the laysword AX, Fig. l.

Heretofore the tension of the controllingspring s has been adjusted by moving a collar in one direction or the other on the ten- 8o sion-rod h and holding itin adjusted position by a set-screw, and manifestly it is practically impossible to thus adjust the spring tension when the loom is in motion, and itis difficult to get the desired tension when the loom is at rest.

We have made the adjusting-collar or abutment slidable on the tension-rod, and by simple means the collar can be moved with ease and great exactness to adj ust the spring ten- 9o sion, whether the loom isin motion or at rest.

Referring to the drawings, the coupling 'm between the tension-rod b and the rockerarm a2 is shown as having an upturned pin m, longitudinally slotted at l0 to loosely re- 95 ceive a headed pin or stud d4 on the rockerarm, the coupling being apertured to receive the end of the tension-rod, which latter is held in place by set-screws 4.

The body of the coupling is provided with roo depending transverse ears m', apertured to receive loosely a controller, shown as a rod nx, provided at its outer end with a handwheel n or other similar device and threaded at its inner end at n', the controller being carried by the coupling in parallelism with the tension and held from longitudinal movement in the coupling by a collar 'n2 between the ears and secured by a screw 6 to the rod nx.

A block or abutment p is slidably mounted on the tension-rod band engages the adjacent end of spring s, said block or abutment having a depending extension p', provided with a screw-threaded hole p2, through which the threaded end n of the controller extends. By rotating the latter in one or 'the other direction the abutmentp will be slid forward or back on the tension-rod b to increase or decrease the tension of spring s, as may be desired, such adjustment of the tension being regulated with great exactness and nicety and with perfect ease, whether the loom is in motion or at rest.

Our invention is not restricted to the preoise construction and arrangement herein shown and described nor to the precise form of let-off mechanism herein illustrated, as changes or modications may be made by those skilled inthe art without departing from the spirit and scope of our invention.

Having fully described our invention, what we desire to claim and secure by Letters Patent is- 1. In let-ott' mechanism for looms, a rocking carrier for the whip-roll, having an attached rocker-arm ,a rod operatively connected therewith, a fixed guide through which said rod is movable longitudinally, an abutment movable on the rod, a tension-controlling spring interposed between the guide and the abutment, and manually-operated means to move the latter toward and from the guide while the loom is in operation and retain the abutment in adjusted position, to regulate the tension of the spring.

2. In let-off mechanism for looms, a rocking carrier for the whip-roll, having an attached rocker arm, a rod operatively connected therewith, a fixed guide through which the rod slides, a slidable abutment on the rod, a

Atension-controlling spring encircling the latter between the abutment and guide, and manually-operated means mounted on the said rod and movable relative thereto to move the abutment toward and from the guide and hold it in adjusted position on the rod.

3. In let-off mechanism forlooms, a rocking carrier for the Whip-roll, having an attached rocker arm, a rod operatively connected therewith, a fixed guide through which said rod is movable longitudinally, an abutment slidable on the rod, a tension controlling spring surrounding the rod between the guide and the abutment, and a rotatable controller carried by the rod and in operative engagement with the abutment, rotation of the controller moving the abutment toward or from the guide to regulate the tension of the spring while the loom is in operation.

4. In let-off mechanism for looms, a rocking carrier for the whip-roll, having an attached rocker arm, a rod operatively connected therewith, a fixed guide through which the rod slides, a slidable abutment on the rod, a tension-controlling spring encircling the latter between the abutment and guide, a rotatable,threaded controller in engagement with the abutment, and means on the rod to support and prevent longitudinal movement of the controller, rotation of the latter sliding the abutment in one direction or the other to vary the tension of the spring.

5. In let-o mechanism for looms, a rocking carrier for the whip-roll, having an attached rocker-arm, a fixed guide, a rod longitudinally movable therein, a coupling connecting it with the rocker-arm, a sliding abutment on the rod, having a threaded hole, a tensioncontrolling spring surrounding the rod between the abutment and the guide, a rotatable controller mounted in the coupling and having a threaded endy to engage the threaded hole in the abutment, and means to prevent longitudinal movement of the controller, rotation thereof moving the abutment to adjust the tension of the controller-spring.

6. In let-olf mechanism forlooms,a rocking carrier for the whip-roll, a tension-controlling spring for said carrier, means, including a movable abutment and an actuating device therefor, to adj ust the tension of the spring, and a su pport for said means,operatively connected with the carrier.

7. In let-off mechanism for looms, a rocking carrier for the whip-ro1l, a tension-controlling spring for said carrier, means, including a movable abutment and a rotatable controller to move it and also to hold it in adjusted position, to regulate the tension of the spring, aud a support for said means, operatively connected with the carrier.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HENRY TOMLINSON. JAMES J. MULDOWNEY. Witnesses:

CLYDE OARLEToN, WILBUR E. Ro'wELL.

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